Improvement in mandrels for holding tapered cast rings



a. BRETTEL'L.

MandriIs-for Holding Tapered Cast Rings.

Patehred June 24.1873

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PHIC 00. NM oseanuss PROL'ES UNITED STATES PATENT OFFICE.

GEORGE E. BRETTELL, OF ROCHESTER, NEW YORK.

IMPROVEMENT IN MANDRELS FOR HOLDING TAPERE-D CAST RINGS.

Specification forming part of Letters Patent No. 140, 113, dated June24,1873; application filed October 5, 1872.

To all whom it may concern.-

'Be it known that I, GEO. E. BRETTELL, of Rochester, in the county ofMonroe and State of New York, have invented an Improved Method ofCutting the Thread on Hollow Castings with Taper Holes, (to be used forbushings for the bung-holes of the barrels,) of which the following is aspecification The object of this invention is to provide the means forcutting the thread on hollow castings with taper holes, to be used forbushings for the bungholes of barrels, in a rapid and effective manner.Such castings are provided with a lug inside the casting, as shown inthe drawing at L, or with a projection or depression at one end to screwthem into the barrel, with suitable wrench or tools. My method. is tohold a number of castings together, so that they may have the threadsout upon them at one time in a lathe or suitable machine. The lathe ormachine must have a tool-holder so arranged as to hold the same numberof cutting-tools as there are castings to be out at one time.

The castings are held by the mandrel A, collars or sleeves B B and D,and the key K. The mandrel A is provided with agroove, a a,

shoulders, and slot for the key K. The shoulcasting exposed for the toolto commence cutting atthe end, as shown. After the castings C C C andcollars or sleeves B B have been put on the mandrel, as shown, thecollar D is slipped on and the key K driven in, by which means thecastings are held firmly together ready to be operated on. The lug L onthe casting fitting in the groove a a on the mandrel, prevents thecasting from slipping on the mandrel while being out. When the castingsC have no lugs inside, but are provided with a projection or depressionat either end, the collars or sleeves B B may be provided with a featheror key to fit in the groove in the mandrel a a to prevent the collars orsleeves from turning round on the mandrel, and the ends of the collarsor sleeves conforming to the depression or projection on the end of thecasting will prevent the castings from turning round on the mandrelwhile having the thread cut. In this manner ten or twelve castings canhave the threads cut on at the same time to great advantage.

What I claim as my invention, and desire to secure by Letters Patent,is-

The method of holding a number of castings together, while the threadsare being out, by means of the mandrel A, collars or sleeves B B and D,and the key K, or its equivalent, substantially as shown and described.

GEO. E. BRETTELL.

\Vitnesses:

FRANCIS S. BRETTELL, JAMES S. GRAHAM.

